Understanding the basis of a novel fruit type in Brassicaceae: conservation and deviation in expression patterns of six genes
Open Access
- 3 September 2012
- journal article
- Published by Springer Science and Business Media LLC in EvoDevo
- Vol. 3 (1), 20
- https://doi.org/10.1186/2041-9139-3-20
Abstract
Background: Variation in fruit morphology is important for plant fitness because it influences dispersal capabilities. Approximately half the members of tribe Brassiceae (Brassicaceae) exhibit fruits with segmentation and variable dehiscence, called heteroarthrocarpy. The knowledge of the genetics of fruit patterning in Arabidopsis offers the opportunity to ask: (1) whether this genetic pathway is conserved in taxa with different fruit morphologies; (2) how the pathway may be modified to produce indehiscence; and (3) whether the pathway has been recruited for a novel abscission zone.Methods: We identified homologs ofALCATRAZ,FRUITFULL,INDEHISCENT,SHATTERPROOF, andREPLUMLESSfrom two taxa, representing different types of heteroarthrocarpy. ComParative gene expression of twelve loci was assessed to address how their expression may have been modified to produce heteroarthrocarpy.Results: Studies demonstrated overall conservation in gene expression patterns between dehiscent segments ofErucaria erucarioidesand Arabidopsis, with some difference in expression of genes that position the valve margin. In contrast, indehiscence in heteroarthrocarpic fruit segments was correlated with the elimination of the entire valve margin pathway inErucariaandCakile lanceolataas well as its absence from a novel lateral abscission zone.Conclusions: These findings suggest that modifications in the valve margin positioning genes are responsible for differences between heteroarthrocarpic and Arabidopsis-like fruits and support the hypothesis that heteroarthrocarpy evolved via repositioning the valve margin. They also highlight conservation in the dehiscence pathway across Brassicaceae.Keywords
This publication has 42 references indexed in Scilit:
- The Same Regulatory Point Mutation Changed Seed-Dispersal Structures in Evolution and DomesticationCurrent Biology, 2011
- MEGA5: Molecular Evolutionary Genetics Analysis Using Maximum Likelihood, Evolutionary Distance, and Maximum Parsimony MethodsMolecular Biology and Evolution, 2011
- A regulated auxin minimum is required for seed dispersal in ArabidopsisNature, 2009
- Water deficit changes the anatomy of the fruit abscission zone in Raphanus raphanistrum (Brassicaceae)Australian Journal of Botany, 2009
- Plant separation: 50 ways to leave your motherCurrent Opinion in Plant Biology, 2005
- Pod shatter‐resistant Brassica fruit produced by ectopic expression of the FRUITFULL genePlant Biotechnology Journal, 2005
- Fleshy fruits – origins, niche shifts, and diversificationOikos, 2005
- Drawing lines and borders: how the dehiscent fruit ofArabidopsis is patternedBioEssays, 2004
- Patterns of Gene Duplication and Functional Evolution During the Diversification of theAGAMOUSSubfamily of MADS Box Genes in AngiospermsGenetics, 2004
- Phyllotactic pattern and stem cell fate are determined by theArabidopsishomeobox geneBELLRINGERDevelopment, 2003